Lens-shield for moving-picture machines.



G. J. GILMORE. LENS SHIELD FOR MOVING PIOTURB MACHINES. APPLICATION IiLBD 1030.30, 1908.

925,326. Patented June15,1909.

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LENS-SHIELD FOB IMOV TG-PICTURE lWIACE-HNES.

Letters Patent. Patented June 15, 1909.

llc it known that i. (him: r. (l. tinivionn, a (it izen of the ll nited States. residing at {Thiago, county of (joolt. and i hale oi illinois. have invented certain new and useful up proveincnts in liens" Shields i'or h'lovi Picture Machines, oi which the followin a specification.

My invention relates to mmxiug'picture machines. and more specifically to the lenses cmhodied therein.

The object of my invention is to provide a protection for the innermost lens, that is the one positioned adjacent to the source or" light in the machine, against the intense heat to which it is at the present time, in the ordinary moving picture machine subjected, hecause of its close proximity to the heat radisling source of light. Because of the coinpara tively great thi cln'iess of the lenses used in such machines, the surfaces of the lens positioned adjacent to the light source, subjected to diderent temperatures, the innerinost surface being sub ected to a very high temperature because of the intense heat ated from the heirs source, whereas the outer surface thereof is exposed only to the ordinary atmospheric temperature. Because of such existing conditionsthe innermost lens not infrequently cracks or breaks, in which event. the lens heconiesnseless, it having to be replaced by a new one, obviously resulting in a financial loss, as well as a loss of tiniennd labor, thcs'eplacing of a broken lens lining, as known especially to those with knowledge of the manipulation of the moving picture machine, '1 lalmrious and an awlnra rd undertaking.

It is therefore my object to eliminate. the possihilitv of such occurrence hy the provision of means .ulaptcd'to he interposed hetwccn the light. source and the iuncrn'iost lens, which will act in the capacity o l a pro lQt'iOli or shield therefor.

A still further ohjccl of my invention is to provide a shield of the charactermentioncd which will he of simple construction, hence ot'low cost to nuinutacturc.

Other ohjccts will appear hereinafter.

lVith these ohjccls in view my invention consists in a shield characterized as zhovc mentioned and in certain details of construction and arrangement of parts all as will he hereinatler fully descrihed and particularly pointed out in the claims.

My invention will he more readily. understood hy reference to the accompanying drawings forming a part of this specification. and in which,

l igure l is a cross sectional view of a moviun' picture machine lens holder or tulle, the "ions, adjaccut to the caroons, there shown, hoing provided with the preferred form of my shield. Fig. 2 is a front elevation of the hody of my shield, and Fig. 3 is a plan view of the transparent sheet used in connection with the body shown in 2.

Referring now to the drawings 1 indicates the ordinary lens holder or tube of a moving picture machine, aportion of the rear wall 2 of the latter being shown in Fi 1. Supported in said lens holder 1 are ordinary lenses and 4, the former being detaehahly secured, as is usual, by means of a flanged ring 5 threaded upon the rearward extremity of the holder, the lens being, as is usual, fixedly secured.

6 indicates the ordinary carbons of an arc lamp, the latter being the ordinary means used in a machine of this character to produce an incandescent light.

It is the lens 3, that as before described, is not infrequently hroken ecansc of the heat radiated by the are lainp. To protectsaid lens Iprovide preferably a sheet metal tubuincinher 7, preferilhly truncated conical in shape, the nne being provided at its extremity of largest circumference, with a circuuiiercntial outwardly extending flange. S, the outer diameter of which is suhstantially the same as the diameter of the lens 3. Said flanged extremity of the member '1' is adapted to rest upon the plane or llat surface of the lens 3, the flange thereof lacing:

adapted to he engaged by the flange ring :3, ,y

the latter thereby obviously acting as a means of holding the same well as tho lens 3 in position. The upper half of said uuaniher 7-is provided with a narrow slot S) intermediate the extremities thereo'f said slot hoing adapted to receive a transparent shoot it), so as to support the same in a plate pc rpcmlieular tolhe axis of the member 7 and hence the lens holder 1. Said sheet may he formed of any suitable transparent material, glass or mica being however pretcrahly used. The lower cc go of said shoot is si udcircularly formed, as shown in Fig". 3, so as to conform to the shape of the lower portion of the member 7 upon which it rests, said lower portion 01: said member 7 heinp; preferably provided with a channel ll lll) ', necessary. By

' holder,

adapted to receive and to form a seat for the reception of said lower edgevof said sheet. Said sheet is thereby removably held in the member 7, hence may obviously be readily and easily removed or replaced when e provision of a shield of such construction it is obvious that the lens will be thoroughly protected from the heat radiated from the ght source, hence will obviate the possibility ofthe tioned occurrences, the 'efiiciency of the ma; chine, bein by such provision, greatly en hanced. owever, though I have'shown the shield body of a truncated conical shape, 1 do not wish to be limited thereto, as the same mightbe of any other suitable shape or design Without departing from the spirit of my invention, and further though I have shown a simple and eflieient means for supporting the transparent sheet, any other suitable means of supporting the same might be emplpyed if desired.

Having described my invention What I claim as new and desire to secure by Letters Patent is:

L In moving picture machine, a. tubular lens holder, a rear lens mounted in said a ring threaded on the rear end 0r said holder and having an inturned flange same,

before men said holder andhaving an mturnecl flange sesame to hold said lens in position, in combination with a sheet metal tubular member having flange interposed between said inturned flange and the lens, and a sheet of transparent material arranged in said tubular member and extending transversely of the substantially as described.

2. In a moving picture machine, a tuba lar lens holder, a rear lens mounted in said holder, a ring threaded on the rear end oi to hold said lens in position in combination with a sheet metal tubular member having a flange at one end interposed between said inturned flange and said lens, said tubular member being provided with a slot in it upper face and a corresponding semicircuni ferential seat in its lower fee -and atrai s1 parent member extending through said s and resting on said seat, substantially described. t

In testimony whereof I have signed my name to this specification in the presence o two subscribing witnesses.

ononsn J. stations Witnesses:

JOSHUA R. It. Poms, HELEN F. Linus. 

